[Ozone-Drm] Move DRM utilities from gpu/ to common/

ui/ozone/platform/drm/gpu/drm_util.cc

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "ui/ozone/platform/drm/gpu/drm_util.h"
-
-#include <stdint.h>
-#include <stdlib.h>
-#include <sys/mman.h>
-#include <xf86drmMode.h>
-
-#include "ui/ozone/platform/drm/gpu/drm_device.h"
-#include "ui/ozone/platform/drm/gpu/screen_manager.h"
-
-namespace ui {
-
-namespace {
-
-bool IsCrtcInUse(uint32_t crtc,
-                 const ScopedVector<HardwareDisplayControllerInfo>& displays) {
-  for (size_t i = 0; i < displays.size(); ++i) {
-    if (crtc == displays[i]->crtc()->crtc_id)
-      return true;
-  }
-
-  return false;
-}
-
-uint32_t GetCrtc(int fd,
-                 drmModeConnector* connector,
-                 drmModeRes* resources,
-                 const ScopedVector<HardwareDisplayControllerInfo>& displays) {
-  // If the connector already has an encoder try to re-use.
-  if (connector->encoder_id) {
-    ScopedDrmEncoderPtr encoder(drmModeGetEncoder(fd, connector->encoder_id));
-    if (encoder && encoder->crtc_id && !IsCrtcInUse(encoder->crtc_id, displays))
-      return encoder->crtc_id;
-  }
-
-  // Try to find an encoder for the connector.
-  for (int i = 0; i < connector->count_encoders; ++i) {
-    ScopedDrmEncoderPtr encoder(drmModeGetEncoder(fd, connector->encoders[i]));
-    if (!encoder)
-      continue;
-
-    for (int j = 0; j < resources->count_crtcs; ++j) {
-      // Check if the encoder is compatible with this CRTC
-      if (!(encoder->possible_crtcs & (1 << j)) ||
-          IsCrtcInUse(resources->crtcs[j], displays))
-        continue;
-
-      return resources->crtcs[j];
-    }
-  }
-
-  return 0;
-}
-
-}  // namespace
-
-HardwareDisplayControllerInfo::HardwareDisplayControllerInfo(
-    ScopedDrmConnectorPtr connector,
-    ScopedDrmCrtcPtr crtc)
-    : connector_(connector.Pass()), crtc_(crtc.Pass()) {
-}
-
-HardwareDisplayControllerInfo::~HardwareDisplayControllerInfo() {
-}
-
-ScopedVector<HardwareDisplayControllerInfo> GetAvailableDisplayControllerInfos(
-    int fd) {
-  ScopedDrmResourcesPtr resources(drmModeGetResources(fd));
-  DCHECK(resources) << "Failed to get DRM resources";
-  ScopedVector<HardwareDisplayControllerInfo> displays;
-
-  for (int i = 0; i < resources->count_connectors; ++i) {
-    ScopedDrmConnectorPtr connector(
-        drmModeGetConnector(fd, resources->connectors[i]));
-
-    if (!connector || connector->connection != DRM_MODE_CONNECTED ||
-        connector->count_modes == 0)
-      continue;
-
-    uint32_t crtc_id = GetCrtc(fd, connector.get(), resources.get(), displays);
-    if (!crtc_id)
-      continue;
-
-    ScopedDrmCrtcPtr crtc(drmModeGetCrtc(fd, crtc_id));
-    displays.push_back(
-        new HardwareDisplayControllerInfo(connector.Pass(), crtc.Pass()));
-  }
-
-  return displays.Pass();
-}
-
-bool SameMode(const drmModeModeInfo& lhs, const drmModeModeInfo& rhs) {
-  return lhs.clock == rhs.clock && lhs.hdisplay == rhs.hdisplay &&
-         lhs.vdisplay == rhs.vdisplay && lhs.vrefresh == rhs.vrefresh &&
-         lhs.hsync_start == rhs.hsync_start && lhs.hsync_end == rhs.hsync_end &&
-         lhs.htotal == rhs.htotal && lhs.hskew == rhs.hskew &&
-         lhs.vsync_start == rhs.vsync_start && lhs.vsync_end == rhs.vsync_end &&
-         lhs.vtotal == rhs.vtotal && lhs.vscan == rhs.vscan &&
-         lhs.flags == rhs.flags && strcmp(lhs.name, rhs.name) == 0;
-}
-
-void ForceInitializationOfPrimaryDisplay(const scoped_refptr<DrmDevice>& drm,
-                                         ScreenManager* screen_manager) {
-  VLOG(2) << "Forcing initialization of primary display.";
-  ScopedVector<HardwareDisplayControllerInfo> displays =
-      GetAvailableDisplayControllerInfos(drm->get_fd());
-
-  if (displays.empty())
-    return;
-
-  screen_manager->AddDisplayController(drm, displays[0]->crtc()->crtc_id,
-                                       displays[0]->connector()->connector_id);
-  screen_manager->ConfigureDisplayController(
-      drm, displays[0]->crtc()->crtc_id, displays[0]->connector()->connector_id,
-      gfx::Point(), displays[0]->connector()->modes[0]);
-}
-
-}  // namespace ui